I used one cqan of oil rec harge and i only used 1 can of 6oz 134a freon which it said was equivelant to one pound i believe my system takes just over two pounds of refrigerent the reason i used 134a was because it was retrofitted with a 134a attachement so i assumed thats what was in the system the psi reader that i used to put the pressure in says its high "80 psi" but that was only with one can of freon one can of oil shot and one can of stop leak so it seems like that reading couldnt be right as there would only be 1 pound of freon in it. i also cant find my manual currently and im having a hard time finding out what the psi reading on the side you put the freon in should be. Thanks for the tips so even though i just replaced the reciever drier i should do so again?